Electric power conversion systems – Cascaded or combined – diverse conversions in which the... – Current and phase
Patent
1975-11-24
1977-06-28
Shoop, William M.
Electric power conversion systems
Cascaded or combined, diverse conversions in which the...
Current and phase
318227, 363 41, H02M 700
Patent
active
040328317
ABSTRACT:
In an inverter apparatus including a plurality of parallel branch circuits connected across a D.C. source, each including a pair of serially connected controllable switching elements, and a plurality of semiconductor elements connected in parallel opposition with respective switching elements, a D.C. reactor is connected on the D.C. side or A.C. side of the inverter and a circuit is connected across the D.C. reactor for preventing attenuation of the current flowing through the D.C. reactor during the OFF period of the switching elements. A source of control pulses is provided for rendering ON respective controllable switching elements each for a 120.degree. interval of the output alternating current. The source of control pulse includes means for chopping the current flowing through each controllable switching element at a predetermined modulation frequency for the former or latter 60.degree. of the 120.degree. interval.
REFERENCES:
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patent: 3340453 (1967-09-01), Bradley et al.
patent: 3388310 (1968-06-01), Etter
patent: 3399336 (1968-08-01), Koppelmann
patent: 3444450 (1969-05-01), Koppelmann
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patent: 3621366 (1971-11-01), Duff
patent: 3622863 (1971-11-01), King
patent: 3710229 (1973-01-01), Jessee
Electronics Design 25, "Which dc/ac Inverter," George A. O'Sullivan, Dec. 6, 1974, pp. 54-59.
Kurosawa Ryoichi
Nabae Akira
Shimamura Takeo
Shimizu Ichirou
Shoop William M.
Tokyo Shibaura Denki Kabushiki Kaisha
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